Locksmith&#39;s instrument to open all standard makes of cylinder locks



g Q. J. BARON INSTRUMENT TO OPEN ALL STANDARDJMAKES 0F CYLINDER LOCKS LOCKSMITHS Filed Jan.5, 1926 WWI Patented Aug. 23, 1927.

UNITED STATES PATENT OFFICE.

GEQBGE JOHN BARON, WILLESDEN, ENG-LAND.

LOQKSKI'I'H'S INSTRUMENT TO OPEN ALL STANDARD MAKES\ OI CYLi [NDER LOCKS.

- Application filed January 5, 1920, Serial No. 78,387, and in Great Britain m 17, 1925.

I cylinder locks.

The essential feature of the said invention 1 lies in the application of percussion which operates a resiliently-controlled plunger adapted to be inserted into the lock, and in the special shape of plunger employed, said plunger during its reciprocatory movements,

v due to percussion and the resilient-control of said plunger, at some time engaging all the pins of the cylinder of the lock and lifting said pins, thus enabling the cylinder to be rotated by a twisting movement which is exerted during such time as percussion is being applied to the plunger.

The instrument may be constructed in various ways, the reciprocatory and twisting movements of the plunger obtaining in all the various constructions.

Of the sheet of drawings accompanying the present specification Figure 1 is an outside view of an instrument in which the plunger is mounted in a metal cylinder.

Figure 2 is a front end view; and,

Figure 3 is a rearend view of said instrument.

Figure 4 is a longitudinal sectional view, showing the plunger in normal or retracted position. a

Figure 5 is a view similar to Figure 4, but showing the plungerat the end of aforward stroke, i. e. after percussion.

Figure 6 is a sectional view illustrative of a distance piece or cap for fitment over the front end of the metal case aforesaid, for use when operating on a lock possessing a lesser number. of spring pins than the plunger is made for.

Figure 7 is a longitudinal sectional view of an instrument wherein the lunger is mounted in a resilient member -0 rubber.

Figure 8 is an elevational view of an instrument wherein the resilient member is constituted by a block or cork.

Like numerals of reference indicate corresponding parts in the several figures,

In carrying out the invention and refer ring firstto Figures 1 to 5 of the drawings, the instrument consists of a metal casing or cylinder 1 which is the stock or-liandle of the appliance, containing a hollow core 2 which is slidably mounted in a 3 in the 4 which closes the other end of said cylinder 1, said core 2 being'provided with a flange 5 between which and the front end of the casing 1 there is interposed a cylindrical spring 6 which normally maintains the flange 5 against the plug 4 aforesaid. In the hollow core 2 aforesaid there is removably inserted the plunger 7 whose front part protrudes through a slot 8 in the front end of the cylinder 1, and which front part is cut to a serrated pattern 9 to engage the spring pin in the cylinder of a lock, the other end of the plunger 7, which is formed with a striking head 10, and extends through a head 11 at therear end of the core 2, being secured in said head 11 or core 2 by means of a setscrew 12.

Further, the front end of the cylinder or stock 1 is provided with two leather or rubber inserts 13 to take against the metal around the keyhole of the lock when the instrument is in use; and, further, there may be provided a setof, or a convenient number of plungers to an instrument, although some plungers will fit three or four different makes of locks, and the serrations may be approximately all the same height or of varying heights.

The method of using the instrument is as follows The plunger 7 which is selected to suit the keyhole of the lock to be opened is fitted in the core 2 of the cylinder 1 and is secured in said core bymeans of the screw 12. The serrated end 9 of the plunger 7 is then inserted in the keyhole of the lock till the inserts 13 in the front end of the cylinder 1 take against the metal around said keyhole, and a few smart taps on the striking head 10 of said plunger 7 with a mallet will cause the percussion, and reciprocatory motion due to said percussion and the reaction of the spring 6 which, acting on the pins of the lock, will, during the one or the other of the reciprocatory movements of the plunger and whilst exerting a slight twisting movement on the cylinder and consequently the plunger, lift all the pins of thecylinder of the lock and open the same just as if the proper key was operating and without damaging the lock in any way.

If the serrated part 9 of the plunger 7 should protrude too far in front of the easing 1,-i. e. have too many teeth or serrations than the lock requires, then use is made of the cap or distance piece 14, shown in'Figure 6, said cap or distance piece 14, WlllCh is provided with slots 15 for the passage of the serrated end 9 of the plunger and with leather inserts 16, being removably positioned over the front end of the cylinder 1, said distance piece or cap 14 being provided interiorly with depressions 17 to take over the inserts 13 in the front end of the cylinder 1 aforesaid.

This lifting of the pins of the lock may be equally well effected by means of the instrument shown in Figure 7. In this case, the metal cylinder, hollow core and spring of the previous arrangement are dispensed with, and the plunger 7.is by its striking head 10 rigidly affixed to a metal ca 18 in which is secured the rear end of a b ock of india-rubber constituting the stock 19, the same being provided with a longitudinal bore 20 to receive therein the body of the plunger 7, the head 10 of said plunger 7 receiving the blow of the mallet, whilst the rubber 19 compresses and expands to effect the reciprocatory movement of the plunger 7 aforesaid, the front end of the said rubberkblock 19 being placed in contact with the loo 1 Instead of a rubber block 19 being employed, use may be made, as shown in Figure 8, of a block 21 of cork, forming the stock, the same, by its rear end, being fitted in a metal cap 18 to which the striking end 10 of the plunger 7 is rigidly affixed, said plunger 7 taking in a longitudinal bore 22 in said cork 21, distance pieces 23 of cork being provided to fit on said plunger 7 and in front of the cork 22 in the event of the front part of the plunger protrudin too far in front of the cork 22 aforesai the head 10 of the plunger 7 receiving the blow of the mallet, whilst the expansion of the cork 22 efl'ects the return or reciprocatory movement of the plunger 7 aforesaid, the front end of said cork 22 or the front end of the distance piece 23 as the case may be being placed against the lock to be opened, a slight twisting being exerted on the cork whilst operating the instrument, as also obtains with reference to the instrument shown in Figure 7 of the drawings.

Further, the serrated portion 9 of the plunger 7 may, instead of being rigid, be made of a flexible, pliable, or malleable metal so that it may be bent by means of a suitable pliers or by ones fingers to accommodate unforeseen shapes or keyhole.

Further, the striking end may be cupped with rubber or other silencing material.

I claim 1. An instrument for unlocking different cylinder locks, comprising a stock, a plunger mounted resiliently in said stock, capable of rotation therewith, and extending therefrom at one end with. a serrated edge and ing through the front end of the casing and its other end extending beyond the pro j ectin end of the core.

3. fn an instrument for unlocking cylinder looks, a casing, a spring controlled hollow core slidably mounted in said casing and projecting at one end beyond the rear end of the casing, the other end of said plunger bein serrated and protruding through the ont end of the casing, said plunger having a striking head extending beyond the head of the hollow core.

4. In an instrument for unlocking cylinder locks, a casing, a spring controlled hollow core slidably mounted in said casing and projecting at one end beyond the rear end of the casing, the other end of said plunger being serrated and protrudin through the front end of the casing, sai plunger having a striking head extending beyond the head of the hollow core, the front face of said casing being equipped with cushioning inserts 5. In an instrument for unlocking cylinder looks, a casing, a spring controlled hollow core slidably mounted in said casing and projecting at one end beyond the rear end of the casing, the other end of said plunger being serrated and protruding through the front end of the casing, said plunger having a striking head extending beyond the head of the hollow core, a spacing member for detachable engagement with the front end of said casing and having a slot for the passage of the serrated end of the plunger, said spacer having cushioning inserts in its front face and recesses in the rear face thereof, the front end of the easing having cushioning elements adapted to fit in said recesses.

6. In .an instrument for unlocking cylinder locks, comprising a plunger, a plunger carrying member, and resilient means surrounding said lunger and engaged by said carrying mem er, whereby said means 1s compressed by a stroke on said member and expanded after said stroke thereby causing said plunger to engage all the pins of the cylinder lock.

7. In an instrument for unlocking cylinder locks, comprising a plunger, a plunger carrying member, and resilient means surrounding said plunger and engaged by Said carrying member, whereby said means is compressed by a stroke on said member and expanded after said stroke thereby causing said plunger to engage all the pins of the cylinder lock, the front end of said plunger projectin beyond said resilient means and'serrate said serrated end bein pliable to adapt it to be bent to accommodate varying shapes of the keyhole in connection with which it is to be used.

In testimony whereof I have aflixed my signature hereto this 14th day of December,

. GEORGE JOHN BARON. 

